This sight features an electronic sensor with an "auto" setting that automatically adjusts the brightness of the 3 aiming dots depending on the amount of daylight. Six additional manual positions allow the selection of lower or higher brightness settings. The three aiming points are 3 MOA size and are calibrated in approximately 10-12 yard increments with arrow speeds of 300 FPS. Waterproof and fog proof. 42mm tube. Weight: 6 oz. Length: 5.5". FOV @ 50 yards: 29ft.